Patent GB-1483602-A (GB)
Title: Fast curing adhesives
IPC: C09J4/02
Filed: 1974-06-05
Abstract: 1483602 Adhesive compositions LORD CORP 5 June 1974 [6 June 1973] 24927/74 Heading C3P [Also in Division B5] An adhesive composition comprises (A) 1- 30% by weight of an elastomeric polymer which is a homopolymer or a copolymer of butadiene, e.g. with styrene, acrylonitrile and/or methacrylonitrile optionally modified by inclusion of not more than 5% by weight, e.g. 0À1-5%, based on the weight of the modified homopolymer or copolymer of a "functional monomer"; (B) 25-85% by weight of an acrylic monomer selected from acrylates, methacrylates, acrylonitrile and methacrylonitrile; (E) 5-20% by weight of methacrylic acid and (F) 0À04-4% by weight of the reducing component of a redox polymerization catalyst system; the ingredients may be present in the adhesive composition in proportions within said limits which produce a composition which, when the composition is coated on to a surface of a first substrate and the oxidizing component of the redox polymerization catalyst system is coated on to a surface of a second substrate following which the two surfaces are brought together, cures under ambient temperature to provide a "handleable bond" in not more than 15 minutes. The term "handleable bond" is defined as meaning that no material movement or distortion about the bonded area occurs when the combination is handled. The elastomeric polymer component preferably has a glass transition temperature below 15 F. The "functional monomer" is defined as comonomer, other than acrylonitrile, styrene and methacrylonitrile, copolymerized into the butadiene homo- or copolymer or any monomer present with the homopolymer or copolymer in free reactive form. Examples of such functional monomers are acrylates, methacrylates, acrylonitrile and methacrylonitrile. The adhesive composition may optionally contain (C) one or more ethylenically unsaturated non-acrylic monomers suitably in an amount 0-50% by weight or (D) a polymer having an intrinsic viscosity of 0À1- 0-3 derived from one or more of the acrylic monomers of (B) or the non-acrylic monomers of (C) suitably in an amount 0-60% by weight. Example 1 discloses compositions comprising (A) acrylonitrile - butadiene elastomer, (B) methyl methacrylate and n-butyl methacrylate, (D) methyl methacrylateÀn-butyl acrylate/ethyl acrylate copolymer, (E) methacrylic acid, (F) diisopropanol-p-toluidine catalysed with benzoyl peroxide. Example 2 discloses compositions comprising: (i) (A) acrylonitrile-butadiene elastomer, (B) methyl methacrylate, (D) methyl methacrylate/n-butyl acrylate/ethyl acrylate, (E) methacrylic acid; and (ii) (A) polybutadiene or butadiene-styrene copolymer, (B) methyl methacrylate and hexyl methacrylate, (D) nbutyl methacrylate/isobutyl methacrylate copolymer with polybutadiene as (A) or methylmethacrylate/n-butyl acrylate/ethyl acrylate copolymer with butadiene-styrene copolymer as (A), (E) methacrylic acid. Example 3 discloses compositions similar to those of Example 2 (i) as above optionally containing polychloroprene. Example 4 discloses compositions comprising: (i) (A) carboxylated acrylonitrile elastomer, (B) methyl methacrylate optionally with 2-ethyl hexyl acrylate and diethylene glycol dimethacrylate, (D) methylmethacrylate/n-butyl acrylate/ethyl acrylate copolymer, (E) methacrylic acid; (ii) (A) carboxylated acrylonitrilebutadiene, (B) methyl methacrylate and n-butyl methacrylate, (E) methacrylic acid; (iii) (A) carboxylated acrylonitrile - butadiene, (B) methyl methacrylate, (C) styrene and chlorostyrene, (D) n-butyl methacrylate homopolymer, (E) methacrylic acid; and (iv) (A) carboxylated acrylonitrile-butadiene, (B) methyl methacrylate, (D) n-butyl/isobutyl methacrylate copolymer and n-butyl methacrylate homopolymer and ethyl methacrylate homopolymer, (E) methacrylic acid. Example 5 discloses a composition comprising (A) acrylonitrile-butadiene elastomer, (B) methylmethacrylate, isobutyl methacrylate, 2-ethyl hexyl acrylate, and isobutyl acrylate, (C) vinyl acetate, (D) methyl methacrylate/n-butyl acrylate/ethyl acrylate copolymer, (E) methacrylic acid to which talc is added.